only difference is the ester....
propoinate is a short ester with a half life of about 2-3 days
cyp & enanth are longer esters with 6-7 day half life
sustanon is a blend of different esters,which ones depends on the lab but usually it has 1 short,2 med,and 1 long
most rec on this board is cyp or enanthate for first cycle 400mg-500mg pw 10-12 wks
but that is just a example bc your stats are not posted so I can not rec anything.